be mixed to make 4 tonnes of iron melt. Let X1, X. X3, X4 and xs denote there amount. Objective is to minimize the cost, i.e., 850 900 500 minimize Z = 1,000 x + 7x, +10x 1,000 1,000 = 0.85x + 0.9x2 +0.5x3 + 7x4 + 10x5- Constraints are on the specifications of iron melt. For iron melt to have a minimum of 3.10% carbon, 0.42x + 3.80x2 + 3.40xz + 100x4 2 3.10 x 4,000 12,400. for iron melt to have a maximum of 3.30% carbon, 0.42x + 3.80x2 + 3.40x3 + 100x4 5 3.30 * 4,000